Renton is located at 47°28'58" North, 122°12'56" West (47.482778, -122.215833).

According to the United States Census Bureau, the city has a total area of 17.30 mi2 (44.81 km2). 17.03 mi2 (44.10 km2) of it is land and 0.28 mi2 (0.71 km2) of it is covered by water. The total area is 1.60% water.

Renton is located in the Pacific Standard Time (PST) timezone, GMT-08:00. It observes Daylight Saving Time (DST).